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    Ubiquiti / Dell switch compatibility issue:

    Scheduled Pinned Locked Moved IT Discussion
    ubiquitidellfiber
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    • coliverC
      coliver @art_of_shred
      last edited by

      @art_of_shred said:

      I think most well-read ML-goers are aware that NTG is sitting on a nice, shiny, new Scale 3-node HC3 cluster. We're trying to get it rolled out, so that we can play and post and do all sorts of fun stuff, but we've hit a bit of a snag that's thrown a wrench into our progress. Our cluster arrived equipped with a pair of Dell X-4012 switches. They're 12-port, all 10Gig-E, managed switches. Their purpose is to function as redundant backplane switches. Our LAN switch in the lab is a Ubiquiti EdgeMax Lite 48-port managed switch. It has only 2- 10Gig-E (SFP+) ports on it, so we're in a bind with having 3 nodes to connect. The simple solution was to give up the redundant backplane switch in favor of having 1 Dell for the backplane network and 1 Dell for the LAN-side connections, and then uplink the LAN Dell switch to a 10Gig-E port on the Ubiquiti. Well, that yields no link lights on the connection. I've Googled with basically no success, and no matter how I configure things, I just can't get the Dells to talk with the Ubiquiti. I saw something about connecting the 10Gig to a 1Gig port, and that didn't make any sense (and also did nothing when I tried it,out of desperation). Anyone with any more experience than myself with fiber, and especially some more insight with regards to switch compatibility over fiber connections,... fire away!

      Going to sound really silly... are you sure the TX and RX sides are flipped? That is generally what happens when you get no connectivity with fiber.

      scottalanmillerS 1 Reply Last reply Reply Quote 1
      • scottalanmillerS
        scottalanmiller @coliver
        last edited by

        @coliver said:

        Going to sound really silly... are you sure the TX and RX sides are flipped? That is generally what happens when you get no connectivity with fiber.

        Like the fiber equivalent of a crossover cable?

        coliverC 1 Reply Last reply Reply Quote 0
        • coliverC
          coliver @scottalanmiller
          last edited by

          @scottalanmiller said:

          @coliver said:

          Going to sound really silly... are you sure the TX and RX sides are flipped? That is generally what happens when you get no connectivity with fiber.

          Like the fiber equivalent of a crossover cable?

          Kind of. I always remember that TX needs to match with an RX.

          art_of_shredA 1 Reply Last reply Reply Quote 1
          • art_of_shredA
            art_of_shred @coliver
            last edited by

            @coliver I know what you're talking about. Some fiber connections have individual terminals for each line. These are composite cables; no option to flip anything.

            1 Reply Last reply Reply Quote 1
            • scottalanmillerS
              scottalanmiller
              last edited by

              So no flipping options? 😉

              1 Reply Last reply Reply Quote 1
              • brianlittlejohnB
                brianlittlejohn @art_of_shred
                last edited by

                @art_of_shred Are you using the same SFP+ adapters?

                coliverC 1 Reply Last reply Reply Quote 1
                • coliverC
                  coliver @brianlittlejohn
                  last edited by

                  @brianlittlejohn said:

                  @art_of_shred Are you using the same SFP+ adapters?

                  That's a good question. Are you using SFP+ adapters that have the Dell firmware (I think?) on them. I know Cisco requires a special chip (again I think) on SFP adapters to work with their switches.

                  1 Reply Last reply Reply Quote 0
                  • J
                    Jason Banned
                    last edited by

                    If they are third party SFPs you might need to run commands to enable them.

                    Also are they are you sure they are multimode and not single mode? and what distance are the meant for? You can burn them up by using them on shorter cables than they are meant to be used with.

                    1 Reply Last reply Reply Quote 0
                    • art_of_shredA
                      art_of_shred
                      last edited by art_of_shred

                      I think @coliver nailed it at the start. Running switch-to-switch seems to require a crossover... but I'm not having any luck finding such a thing. I guess maybe you need to buy the separate transceivers and individual fiber cables to be able to cross them? The composite cables don't appear to come in a crossed configuration.

                      coliverC 1 Reply Last reply Reply Quote 0
                      • coliverC
                        coliver @art_of_shred
                        last edited by

                        @art_of_shred said:

                        I think @coliver nailed it at the start. Running switch-to-switch seems to require a crossover... but I'm not having any luck finding such a thing. I guess maybe you need to buy the separate transceivers and individual fiber cables to be able to cross them? The composite cables don't appear to come in a crossed configuration.

                        Can you take a picture of the cable? I've never seen one that doesn't have the ability to come apart.

                        J 1 Reply Last reply Reply Quote 0
                        • J
                          Jason Banned @coliver
                          last edited by

                          @coliver said:

                          @art_of_shred said:

                          I think @coliver nailed it at the start. Running switch-to-switch seems to require a crossover... but I'm not having any luck finding such a thing. I guess maybe you need to buy the separate transceivers and individual fiber cables to be able to cross them? The composite cables don't appear to come in a crossed configuration.

                          Can you take a picture of the cable? I've never seen one that doesn't have the ability to come apart.

                          Most of them come with clips on them. They usually can be removed but I've never ran into one backwards from the factory.

                          1 Reply Last reply Reply Quote 0
                          • art_of_shredA
                            art_of_shred
                            last edited by

                            Here's what we have...
                            (http://www.newegg.com/Product/Product.aspx?Item=N82E16833997115)

                            J 1 Reply Last reply Reply Quote 0
                            • J
                              Jason Banned @art_of_shred
                              last edited by

                              @art_of_shred said:

                              Here's what we have...
                              (http://www.newegg.com/Product/Product.aspx?Item=N82E16833997115)

                              Oh, that's not fiber.. that's copper Twinax. Twinax isn't something you generally do between differing models of switches. Because you need compatible SFPs on each end.

                              art_of_shredA 1 Reply Last reply Reply Quote 3
                              • art_of_shredA
                                art_of_shred @Jason
                                last edited by

                                @Jason said:

                                @art_of_shred said:

                                Here's what we have...
                                (http://www.newegg.com/Product/Product.aspx?Item=N82E16833997115)

                                Oh, that's not fiber.. that's copper Twinax. Twinax isn't something you generally do between differing models of switches. Because you need compatible SFPs on each end.

                                So what's the best way to make a 10G/10G connection between the 2 switches? Should I get fiber and cross it over?

                                1 Reply Last reply Reply Quote 0
                                • J
                                  Jason Banned
                                  last edited by

                                  These are the only supported options on the Unifi.. for 10GB.

                                  10GBase-SR

                                  Fiberstore SFP-10G85-3M MMF
                                  DAC/Twinax

                                  Addon SFP-10G-PDAC1M-AO
                                  Juniper ex-sfp-10ge-dac-1m - (Amphenol 584990001 Rev A)
                                  This is a 10g DAC that appears to link up at 1g when both ends are plugged into the two SFP slots of the ES-24-250W
                                  I haven't tested sending traffic over this cable, as I only have one ES-24-250W, and Juniper equipment wants to link up at 10g when using this DAC
                                  MikroTik S+DA0001
                                  Molex 74742-0001

                                  1 Reply Last reply Reply Quote 1
                                  • coliverC
                                    coliver
                                    last edited by

                                    10GBase-SR is what I would recommend. Get fiber between the switches that seems to be one of the best ways. How close are the switches can you do 10G over twisted pair?

                                    I've never heard of Twinax, which isn't unusual just interesting.

                                    art_of_shredA 1 Reply Last reply Reply Quote 0
                                    • brianlittlejohnB
                                      brianlittlejohn
                                      last edited by brianlittlejohn

                                      I'm using twinax to connect my servers to my backup storage, but the sfp+ adapters are connecting to the exact same Intel cards in both cases.

                                      1 Reply Last reply Reply Quote 0
                                      • art_of_shredA
                                        art_of_shred @coliver
                                        last edited by

                                        @coliver said:
                                        How close are the switches ?
                                        can you do 10G over twisted pair?

                                        1. They're pretty much touching each other
                                        2. Yes you can, but these Dell's have no RJ-45 ports

                                        Fiber seems to make the most sense for this connection.

                                        coliverC 1 Reply Last reply Reply Quote 0
                                        • coliverC
                                          coliver @art_of_shred
                                          last edited by

                                          @art_of_shred said:

                                          @coliver said:
                                          How close are the switches ?
                                          can you do 10G over twisted pair?

                                          1. They're pretty much touching each other
                                          2. Yes you can, but these Dell's have no RJ-45 ports

                                          Fiber seems to make the most sense for this connection.

                                          Yep, if you are going to invest in the modules anyway fiber is the way to go.

                                          1 Reply Last reply Reply Quote 1
                                          • DustinB3403D
                                            DustinB3403
                                            last edited by

                                            Gone are the days when you could go into CompUSA and pick up a part like this, unless you guys have a few cards around the office or have a few connections to get equipment to set this up...

                                            Seems like a few more days before this'll be up.

                                            coliverC dafyreD 2 Replies Last reply Reply Quote 1
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